Pump



1 ntea-v oet. 11, 1921.

Nl. E. FOSS.

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moms/frs MANTON E. FOSS, OF WILDER, MINITESOTA.

PUMP;

Application led June 8, 1920.

To all wlw/az, t may concern it known that I, Mannion Foss, a citizen ot the United States, and. a. resident of filder` in the county of Jackson and State of Minnesota., have inventedl certain new and useful improvements in Pumps, of which the followinga is a specifica-tion.

My invention is an improvement in pumps, and the invention has for its object to provide a double cylinder pump, each cylinder of which is double acting, thus providing what is, in effect, a quadruple actingy pump, fluid beine' drawn into the pump and ejected from each end of the barrel `at each stroke oi the plunger in each direction.

In the drawings:

Figure 1 is vertical section through'the improved pump;

Fig. 2 .is a section on the line 2 2 of Fig. l;

Fic: 3 an enlarced detail section of the t upper valve.

In the present embodiment oft the invention the improved pump is composed of two similar cylinders l and' la, which, at their lower ends, are threaded into openings in the top of a casing 2, which is supported by a suitable base 3, the base having upstanding` arms fl which have inwardly extending lugs at theirtops, abutting' the under face of the casing' f2 and secured thereto, as shown.

Each cylinder 1 and? Ia has a. lateral port 6 at its lower end which communicates with the chamber or casing` 2, and a discharge pipe 7 leads upwardly from the chamber between the cylinders l and 1a, the lower end of the discharge pipe beingthreaded into an opening in the top of the casing. At their upper ends the cylinders l vand 1av have lateral ports 8, which communicatev by pipes 9, which may be of rubber or the like, with laterally extendingY nipples on a valve casing which is threaded on to the upper end of the discharge pipe 7, and which will be presently described in detail.

A plunger is arranged in each cylinder, each plunger consisting of an upperkhead 11 and a lower head 12, the said heads being truste-conical and arranged with their smalll ends adjacent, and each head has threaded engagement with a stein- 13. Referring to Fig'. 1', it will loe seen that the lower end of each stem 13 is reduced, as shown at 14, and that the reduced portion ot each stem is threaded., as is also that portion of the body of the stem just above the reduced portion.

Specification of Letters Patent.

Patented Get. 11, 1921. Serial No. l387,4!75.

Thesepertions are oppositely threaded, one;

the body, being threaded with a left hand thread and the other, the reduced portion, with a right hand thread.

A sleeve lf of leather or the like is ar ranged between the heads, the said? sleeve fitti-net over the small ends of and-f it will be obvious that by turning' the head 12" thesl'eeve 15 may be expanded, to'v compensate for' wear, tosecure better action ot the pump. Thestems 13 pass through stuilng boxes at the upper ends of the cyl'- in-der, to bek later described, and they are conneete'd with attivo-part handle above the same. This handle, as shown, consists ofA a central sleeve 17 of metal, within which .the stems 1B have threadedengagement, and a pair of handle members 18 of wood or the like, which are inserted into thev sleeve from the opposite ends, and which have means for interengaeing" toV lock them in place in the sleeve. @ne ot these sections has a threaded axia-lstern as shown', and the other an axial recess for engagement by the stem.

At the lower end of each cylinder there is provided in the chamber 2 an internally threaded opening, with which` is engaged a valve casing, consisting of an inner section 139" a-nd' an outer section 20. The" inner section is a: valve seat and guide and is threaded into the opening, and the outer sectionV is threaded on to the reduced outer end of the inner section.

The outer section 20 of each valve casing has a marginalrib at its outer end and be-v tween this rib and a sleeve 21, which is held on the inner sectiomthere is arranged a coil spring 22, thev said spring acting to force the sleeve inwardly. The seat and guide; 19 has va lateral port, as shown, and the sleeve 21 has a similar port registering therewith. the section 20 and the section 191 The valve 23 has a stem 24! which passes through the guide or inner section into the outer section andV is encircled by a spring 25, which abuts at one end the section 1'9 and at the other a stop on the stem, the stop beingin the form of a washer and Cotter pin. The spring normally/*holds the .valve closed.

The valve casing;y at the top of the cylinders consists of a section 10 which is threaded' on to the upper end of the discharge pipe 7, a section 2G which has threaded engagement with the section 10, a section 27 which is a val.'ve"`seat and guide and' is the heads,

A packing is arranged betweenV threaded into the section 26, and a section 28 which is threaded on `to the section 2T, the outer end of this section being reduced to receive the section 28. The upper end of the discharge pipe 7 is reamed to form a valve seat with which coperates a valve 29. The valve has a stem 30, which is hollow, and of a -second valve 32 which cooperates with the lower end of the section 26 of the casing, the said end being formed into a valve seat.v

A coil spring 33 is arranged between the Y valves and acts normally to seat both valves.

Another valve 34 cooperates with the lower end of the section 7, this section being like the section 19 of Fig. 1. This valve has` a stem 35 which passes through the guide into the section 28 and is encircled by a springv 36 arranged between the end ot the section 27 anda stop on the stem A sleeve 37, similar to the sleeve 21 of Fig. 1, encircles 4the section 27, and a coil spring 38 is arranged between the outer end of the secion 28 and the sleeve, acting normally to push the sleeve toward the section 26, and, as will be seen, packings are arranged between the section 28 and the sleeve and between the sleeve and the section 26, and the sleeve has a port which communicates with the lateral port ot the section 27. The section 26 has oppositely extending nipples with which are. connected the pipes 9 before mentioned, and a flexible hose 39 is connected with the section 1() of the valve casing at a port 40 in the said section.

vReferring to Fig. 1, it will be seen that the head 12 has longitudinally extending openings, whose axes diverge outwardlyv and downwardly.` Each of these openings 41 consists of two portions of unequal diameter, and a headed peg is arranged in each opening, the body of the peg passing through the portion ot less diameter', while the head moves in the portion of greater diameter. A spring 42 is arranged above each head and a plug 43 is threaded into the top of each of the openings. The bottom oit the casing 2 is recessed to receive these pegs when the plungers move downward to 'their limit. rPhe arrangement is such that theV pegs are extended through the bottom of the heads normally, but may yield upwardly. The sleeves 21 and 37, which may be of brass or the like, are dust covers, and when the pump is not in use they are turned to bring their ports out ofregister with the ports of the valve seat and guide with which they coperate.

Referring to Figs. 2 and 3, it will be seen that each sleeve has a radial rib at its outer end which is roughened, to permit them to easily turn. Referring to Fig. 1 it will be seen that each of the stuHing boxes betere mentioned consists of a cup shaped outer in which is slidable the stem 31Y section 16 which is threaded into the cylinder and a section 16a which is threaded into the outer section. These sections have registering bores through which the upper' ends of the stems 13 pass, and it will be noted that the stems are reduced at their upper ends.

,The packing 43 is arranged between the sections 16 and 16 and the inner end of the bore in the cup shaped section 16 is trusto-conical or reduced at its inner end. The inner end of the section 16 is also tapered and it will be evident that when the section 16a is screwed into thesection 16 the packing will be expanded laterally to form a tight closure. The arrangement tends to orcethe packing toward the stem.

At the junction of the reduced portion of each stem with the body thereof, the stem tapers, this tapering portion coming at the packing when the' plungers are near the bottoms ot the cylinders. Thus when the stems move upwardly the packing will be expanded, forming a tight closure between the packing and the stem. When the stems are pushed down as tar as possible and the packing is tightened on them it will be obvious that when the stems are pulled up the packing is packed still tighter.

1n order to expand the plunger it is only necessary to push down the plunger'until the pegs 42 will engage the 'openings in the bottomy of the casing 2. by turning the stem in the tion, it will be evi 12 will be turned up toward the upper head 11, since the said head 12 is held by the pegs, thus expanding the plunger. When the stem is so turned, both heads will remain fixed and both will be moved simultaneously toward each other.

ln operation, whenthe plungers are moved upwardly from the position of Fig. 1, air will be drawn into the lower ends ot the cylinders past the valves 23, and air above the pistons or plungers will be `ejected through the ports 6 into the casing 10, trom whence the air will pass by the valve 32 to the hose 39. Then the plunger moves downwardly the air below the plungers will be forced out through the pipe 7, past the valve 29 and into the hose 89.

Air will be drawn into the upper ends of the cylinders past the'valve 34;. The valves 82 and 29 constitute a double check, the valve 29 permitting the passage from the pipe 7 to the hose, but preventing passage of air from the casing 10 to the pipe 7. The valve 32, on the other hand, permits the passage ot .air Jfrom the cylinders to the section 10, but prevents passage of air from the pipe 7 to the cylinders.

'1 claim:

1. A pump. comprising a pair ot cylin ders and a discharge tube arranged between proper direc- Adent that the lower head Then this is done Y them and having a hose at its upper end, a plunger in each cylinder, means for simultaneously moving the plungers, a check valve at the bo-ttom of each cylinder 'for admitting .air thereto, lateral ports at the ends of the cylinders communicating With the discharge tube, checks at the top of the said tube for permitting the admission of air to the cylinders on the down stroke of the plungers and for preventing the passage of air from the discharge tube to the cylinders and for permitting the passage of air from the'cylinders to the hose on the up stroke of the plunger-s and for preventing discharge of the air to the atmosphere.

2. A pump comprising a pair of cylinders, a discharge tube common to both cylinders and connected thereto at the opposite ends thereof, a plunger in each cylinder, means tor simultaneously moving the plungers, a

check valve at the bottom of each cylinder` for admitting lair thereto, checks at the top ot the said tube for permitting the admis sion of air from the atmosphere on the doWn- Ward stroke of the plungers and for preventing the passage of air from the discharge tube to the cylinders and for permitting the passage of air from the cylinders to the discharge tube on the 11p-stroke of the plungers Iand for preventing discharge of the air to the atmosphere.

3. 1n a pump, a cylinder and a plunger, said plunger comprising a stem, and a pair of frusto-conical heads having threaded engagement therewith, said heads being arranged' ivith their small ends adjacent and being oppositely threaded on to the plunger, and a sleeve of flexible material encircling the stem and engaging the small ends of the heads, the inner head of the plunger having spring supported pins mounted to move inwardly and normally spring pressed beyond the inner end of the head, the cylinder having openings for engagement by the pins to prevent rotation oi' the head to permit the stem to be turned With respect thereto.

e. ln a pump, a cylinder and a plunger, said plunger comprising a stem, and a pair of truste-conical heads having threaded engagement therewith, said heads being arranged ivith their small ends adjacent and being oppositely threaded on to the plunger, and a sleeve of iiexible material encircling the stem and engaging the small ends of the heads.

In a pump, a pair of cylinders, a pair of plungers therein, a sleeve, a link connecting each plunger With the sleeve and having a detachable connection with the sleeve, and a sectional handle, each section having a portion extending Within the sleeve, the portions of the tivo sections having interengaging means releasable by turning the sections With respect to each other. Y

Mn. MANTON E. FOSS. 

